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Advisor(s)
Abstract(s)
Slurry separation using mechanical and
chemical methods is one of the options considered to
solve problems of slurry management at the farm
scale. The fractions obtained with such treatments
have distinct compositions, which allow different
options for their utilization (composting, direct
application, and fertigation). In this study, four
fractions of slurry were obtained using a combined
treatment system including slurry treatment with a
screw press separator (solid and liquid fractions)
followed by sedimentation with the addition of
Polyacrylamide (PAM) (PAM-Supernatant and
PAM-Sediment) to the LF. These fractions were then
incorporated into arable soil under controlled laboratory conditions and the organic N degradation from
each treatment was followed for 94 days. Total N
emissions (N2O + N2
) as well as the sources of the N
emissions (nitrification or denitrification) were also
studied during this period.
Results showed that the slurry fractions (SFs) had
distinct behavior relative to the whole slurry (WS),
namely in terms of N degradation in soil, where
N mineralization was observed only in the WS
treatment whereas N immobilization occurred in the
other treatments. In terms of N2O emissions, higher
losses, expressed as a percentage of the total N
added, occurred from the LF treatments (liquid,
PAM-Supernatant and PAM-Sediment).
This work indicates that the slurry treatment by
mechanical and chemical separation may be a good
option for slurry management at the farm scale since
it allows greater utilization of the different fractions
with a small effect on N2O emissions after SFs’
application to soil
Description
Keywords
Dairy-cattle slurry N immobilization N mineralization N2O emissions Polyacrylamide Slurry treatment Slurry separation
Citation
Fangueiro D., Pereira J., Chadwick D., Coutinho J., Moreira N., Trindade H., 2008. Laboratory assessment of the effect of cattle slurry pre-treatment on organic N degradation after soil application and N2O and N2 emissions. Nutrient Cycling in Agroecosystems 80, 107-120.
Publisher
Springer